Rename item list for python-CodePudding

I have a list of items

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]

or any other list of 16 items.

How to replace the first 12 items with '#'?

CodePudding user response：

One possible solution:

lst = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]

lst[:12] = "#" * 12
print(lst)

Prints:

['#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', 13, 14, 15, 16]

CodePudding user response：

You can use list slicing and concatenation:

arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16] 
print(['#'] * 12   arr[12:])

Output:

['#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', 13, 14, 15, 16]

The expression

['#'] * 12   arr[12:]

simply takes ['#'], multiplies it with 12 to make it

['#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#']

and concatenates it with the element of arr after the 12th element.